Torque Converter Clutch Control Valve Control

Lock-up control system diagram

Fig 1: Lock-Up Control System Diagram

Courtesy of NISSAN MOTOR CO., U.S.A.

Lock-up Released

• In the lock-up released state, the torque converter clutch control valve is set into the unlocked state by the torque converter clutch solenoid and the lock-up apply pressure is drained.

  In this way, the torque converter clutch piston is not coupled.

Lock-up Applied

• In the lock-up applied state, the torque converter clutch control valve is set into the locked state by the torque converter clutch solenoid and lock-up apply pressure is generated.

  In this way, the torque converter clutch piston is pressed and coupled.